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from test_utils import simple_assert
def with_banner(x):
header = '#################################################################'
text = '# {}'.format(x)
footer = '#################################################################'
return '\n'.join([header, text, footer])
def starts_with(prefix, x):
"""Return True if `x` starts with `prefix`."""
return x.startswith(prefix)
def ends_with(prefix, x):
"""Return True if `x` starts with `prefix`."""
return x.endswith(prefix)
def trim_prefix(prefix, x):
"""Remove `prefix` from `x` if present."""
if x.startswith(prefix):
return x[len(prefix):]
else:
return x
actual = [trim_prefix('"', '"leading"'), trim_prefix('"', 'non-leading')]
expected = ['leading"', 'non-leading']
simple_assert(actual, expected, name="trim_prefix")
def trim_suffix(suffix, x):
"""Remove `suffix` from `x` if present."""
if x.endswith(suffix):
amt = len(x) - len(suffix)
return x[0:amt]
else:
return x
actual = [
trim_suffix('ing"', '"trailing"'),
trim_suffix('ing"', 'non-trailing')
]
expected = ['"trail', 'non-trailing']
simple_assert(actual, expected, name="trim_suffix")
def trim_surrounding(b, x):
"""Remove `b` from `x` if present as prefix and suffix."""
if x.startswith(b) and x.endswith(b):
x = trim_prefix(b, x)
x = trim_suffix(b, x)
return x
else:
return x
actual = [
trim_surrounding('"', '"surrounded"'),
trim_surrounding('"', 'non-surrounded'),
trim_surrounding('"', '"just-prefixed'),
trim_surrounding('"', 'just-suffixed"'),
]
expected = ['surrounded', 'non-surrounded', '"just-prefixed', 'just-suffixed"']
simple_assert(actual, expected, name="trim_surrounding")
def indent(x, spaces=2):
"""Indent string `x` number of `spaces`, defaulting to two."""
return '\n'.join([' ' * spaces + line for line in x.split('\n')])
actual = indent("""testing
this function
out""")
expected = """ testing
this function
out"""
simple_assert(actual, expected, name="indent")
actual = indent("""testing
this function
out""", spaces=4)
expected = """ testing
this function
out"""
simple_assert(actual, expected, name="indent")
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